Maybe I missed it the first time, but what was it in particular that made you question that decision?
Before talking to you....penetration. I'm thinking that many of the situations I may face will require (at some point) a round that can penetrate vehicles and building material and still remain lethal. Now that I understand what happens after a round is fired (everybody runs for cover or escape) it just seems like it would be advantageous to be able to get behind most cover. To turn cover into concealment as someone posted.
I just cannot imagine the need for stopping a group of charging BG's were the need for fast followups is key.
Anyway thats the confusion for me.